Before you do scam ads, understand the market you work in, or else you'll get found out.
Unsealed dm in Thailand? . DM sent to Thai house wives, up-country ? With English copy inside??? I don't think so.....! In Thailand, Thais predominantly speak Thai and read Thai. English is a very very distant second. Up-country, no Thai house wife speaks, let alone reads English, or more to the point English dm copy.